Having soaked a peice of tufnol in synthetic 2-stroke oil for a number of
months, I can confirm that it swelled.
However, the particular brand of 2S oil (Castrol TTS) is known to contain a
small amount of white spirit; it might have been the latter substance that
was responsible for hte swelling.
It all depends how close your tolerances are on the initial se-up. If the
tolerances are slack, then the bearing may even benefit from a little
swelling.
Duncan McF.
----- Original Message -----
From: "Tony Renshaw" <tonyrenshaw@optusnet.com.au>
Subject: Europa-List: Tufnol Lubricants (the definitive answer)
<tonyrenshaw@optusnet.com.au>
>
> Gidday,
> Over the years there has been an ongoing thread regarding the lubricants
of
> choice for the tufnol bearings. I am just about to install my module and
> recognise now is the right time to apply a lubricant. My controls are
> relatively loose anyway, except for a small binding at "full left
aileron".
> I understand hydrocarbon based lubricants are not ideal, but I don't know
> why. I think it has something to do with the potential swelling of the
> tufnol, but I am not certain. So, people talk about synthetic oils etc,
> silicone based or non-silicone. Now I know silicone near a surface to be
> bonded is "Bad", but I do not intend on bonding anywhere near my bearings
!!
> So, can someone please tell me more about these lubricant options. I
> believe some of the pushbike lubricants may well be good, but am
> floundering a little on a lack of knowledge.
> Thanks in anticipation
>
> Reg
> Tony Renshaw
> Sydney Australia
>
> Classic 236 B.B. Taildragger
> Tail, Wings, Ailerons, Flaps Complete and Connected
> Lower Fuse in Jig, Tail Torque Tube installed
> Mass Balance assembly installed and deflections sorted
> Roof Panel between doors completed.
> Photos at:
>
http://forum.okhuijsen.org/modules.php?set_albumName=TonyR&op=modload&name=g
allery&file=index&include=view_album.php&PHPSESSID=902b69917a45f8b18ac84fe3f
85a704b
> Intended Engine: 912S CS prop (model undecided)
> Instrumentation: Undecided
>
>
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